WO2023135836A1

WO2023135836A1 - Stator and electric motor having same

Info

Publication number: WO2023135836A1
Application number: PCT/JP2022/024175
Authority: WO
Inventors: 謙一岩田
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2022-01-11
Filing date: 2022-06-16
Publication date: 2023-07-20

Abstract

This stator is provided with: a stator core (16), of a substantially cylindrical shape, having slots (24, 25); a pair of insulators for sandwiching the stator core (16) from both sides in the axial direction of the substantially cylindrical shape; and, windings (8, 9) annularly wound in the stator core (16) with the pair of insulators interposed therebetween. Each of the pair of insulators has: a base section that has a planar section orthogonal to the axial direction and contacts an end section of the stator core (16) in the axial direction of the substantially cylindrical shape; a wall section that extends axially along the inner wall of the slot (24, 25) from the base section; and, a slot cell (51, 53), of a substantially cylindrical shape, fitted to the inner periphery of the wall section.

Description

Stator and electric motor having it

The present disclosure relates to a stator and an electric motor having the same.

A motor is known that has a stator with a pair of insulators mounted above and below a stator core. (See Patent Document 1, for example). The stator will be described below with reference to FIGS. 13, 14A and 14B.

FIG. 13 is an exploded perspective view showing the configuration of a conventional stator. 14A and 14B are cross-sectional views showing a conventional stator before and after attachment of an insulator. Here, FIG. 14A is before the insulator is attached, and FIG. 14B is after the insulator is attached.

As shown in FIG. 13, in the conventional stator 100, a pair of insulators (insulator 101a, insulator 101b) are attached so as to sandwich the stator core 102 from above and below. The insulator has a plurality of cylindrical wall portions extending in a direction orthogonal to the base portion having the flat portion and covering the wall surfaces of the slots. Further, as shown in FIGS. 14A and 14B, the conventional insulator is mounted on the stator core 102 by overlapping the walls of the upper insulator 101a and the walls of the lower insulator 101b inside the slots 103. be. Electrical insulation between the winding and the stator core is performed by winding the winding in the slot through the insulator. A motor equipped with such a stator has a feature that the number of parts is small, so that the number of assembly steps can be reduced.

Japanese Unexamined Patent Application Publication No. 2012-200116

　Conventional insulator configurations have structural problems, particularly due to the attachment of insulators, and there is room for improvement from the standpoint of improving the electrical efficiency and assembly workability of electric motors.

Specifically, in the configuration of the conventional stator, a clearance is provided to prevent contact between the upper and lower wall portions when the upper and lower wall portions of the insulator are overlapped inside the slot. In this case, the slots are narrowed by the thickness of the upper and lower walls and the width of the clearance (dimension Y in FIG. 14B), and the slot space factor of the winding is reduced. In addition, when the winding is wound, the distance between the winding and the stator core is increased by the thickness of the upper and lower walls and the width of the clearance, which increases the circumference of the winding and increases the electrical resistance of the winding. The increase may reduce the electrical efficiency of the motor.

In addition, in the structure of the conventional stator, when the wall portion of the insulator is inserted into the slot, tensile and compressive stresses are applied in the radial direction starting from the inner peripheral portion, causing deformation such as bending of the outer peripheral portion in the circumferential direction. Sometimes. In this case, deformation of the outer peripheral portion of the insulator during installation may shift the positional relationship between the wall and the slot, requiring extra time and effort to fit them together, which may become a bottleneck in reducing the number of work steps.

One of the objects of the present disclosure is to provide a stator and a motor having the same that improve the electrical efficiency of the motor and improve the workability of the insulator mounting process by approaching the insulator. .

A stator according to an aspect of the present disclosure includes a substantially cylindrical stator core having a plurality of slots, a pair of insulators sandwiching the substantially cylindrical stator core from both sides in the axial direction, and the stator core through the insulators. The insulator has a planar portion orthogonal to the axial direction, a base portion in contact with the axial end portion of the substantially cylindrical stator core, and a slot extending from the base portion. It comprises a plurality of wall portions extending axially along the inner wall, and a generally cylindrical slot cell mounted on the inner periphery of the wall portions.

According to the present disclosure, by approaching the insulator, it is possible to provide a stator and a motor having the stator that improve the electrical efficiency of the motor and improve the workability of the insulator mounting process.

FIG. 1 is a side view of a ceiling fan equipped with an electric motor according to an embodiment of the present disclosure; FIG. FIG. 2 is a cross-sectional view of an electric motor according to an embodiment of the present disclosure; FIG. FIG. 3 is a plan view showing a partial cross-section of a stator according to an embodiment of the present disclosure; FIG. FIG. 4 is an exploded perspective view showing the configuration of a stator according to an embodiment of the present disclosure; FIG. 5A is a perspective view of a first insulator of a stator according to an embodiment of the present disclosure; FIG. 5B is a perspective view of a first insulator of a stator according to an embodiment of the present disclosure; FIG. 6A is a perspective view of a second insulator of a stator according to an embodiment of the present disclosure; FIG. 6B is a perspective view of a second insulator of a stator according to an embodiment of the present disclosure; FIG. FIG. 7A is a diagram illustrating a stator assembly procedure according to an embodiment of the present disclosure; 7B is a diagram illustrating a stator assembly procedure according to an embodiment of the present disclosure; FIG. FIG. 7C is a diagram illustrating a stator assembly procedure according to an embodiment of the present disclosure; FIG. 7D is a diagram illustrating a stator assembly procedure according to an embodiment of the present disclosure; FIG. 8A is a cross-sectional view showing a vertical cross-section of a stator according to embodiments of the present disclosure; FIG. 8B is a cross-sectional view showing a vertical cross-section of a stator according to an embodiment of the present disclosure; FIG. 8C is a cross-sectional view showing a vertical cross-section of a stator according to an embodiment of the present disclosure; FIG. 8D is a cross-sectional view showing a vertical cross-section of a stator according to an embodiment of the present disclosure; 9 is a cross-sectional view of a stator according to an embodiment of the present disclosure taken along line AA shown in FIG. 2. FIG. FIG. 10 is a cross-sectional view showing a longitudinal section along line EE shown in FIG. 3 of a stator according to an embodiment of the present disclosure. FIG. 11A is a perspective view showing an enlarged main part of the first insulator of the stator according to the embodiment of the present disclosure; FIG. 11B is a perspective view showing an enlarged main part of the first insulator of the stator according to the embodiment of the present disclosure; FIG. 12A is a perspective view showing an enlarged main part of the second insulator of the stator according to the embodiment of the present disclosure; FIG. 12B is a perspective view showing an enlarged main part of the second insulator of the stator according to the embodiment of the present disclosure; FIG. 13 is an exploded perspective view showing the configuration of a conventional stator. FIG. 14A is a cross-sectional view showing a conventional stator before and after insulator mounting. FIG. 14B is a cross-sectional view showing a conventional stator before and after insulator mounting.

Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings. In the embodiments and modified examples, the same or equivalent constituent elements and members are denoted by the same reference numerals, and duplication of description will be omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in each drawing, some of the members that are not important for explaining the embodiments are omitted.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various components, but these terms are used only for the purpose of distinguishing one component from other components, and the terms The constituent elements are not limited by

A motor 2 according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a side view showing a ceiling fan 1 equipped with an electric motor 2 according to this embodiment. FIG. 2 shows a longitudinal section along the rotation axis of the electric motor 2. As shown in FIG. Although the use of the electric motor 2 is not limited, as an example, the electric motor 2 can be suitably mounted on a ceiling fan.

The ceiling fan 1 includes a support 4, a shaft 6, blades 3, a body cover 5, and an electric motor 2.

The column 4 is a hollow cylindrical member extending downward from the ceiling.

The shaft 6 is a vertically extending hollow shaft and is fixed to the lower end of the column 4 .

The blade 3 has a substantially rectangular plate shape and is provided on the outer circumference of the electric motor 2 .

The main body cover 5 has a substantially hemispherical dome shape and covers the lower side of the electric motor 2 .

The electric motor 2 is an external rotation type AC electric motor. The electric motor 2 includes a running capacitor 10 , an upper cover 11 , a rotor cover 12 , bearing housing portions 13 a and 13 b , ball bearings 14 a and 14 b , a rotor 19 and a stator 20 .

The operating capacitor 10 supplies the electric motor 2 with AC voltage. A running capacitor 10 is provided on the side surface of the shaft 6 .

The upper cover 11 covers the rotor 19 and the stator 20 from above and is fixed to the outer circumference of the rotor 19 .

The rotor cover 12 covers the stator 20 from below and is fixed below the rotor 19 .

The bearing housing portion 13a is a recess formed in the rotor cover 12 and supports the outer ring of the ball bearing 14a. The bearing housing portion 13b is a recess formed in the upper cover 11 and supports the outer ring of the ball bearing 14b.

The inner ring of the ball bearing 14a and the inner ring of the ball bearing 14b are fixed to the shaft 6. In the ball bearing 14a and the ball bearing 14b according to this embodiment, the inner ring is the fixed ring and the outer ring is the rotating ring.

The rotor 19 has a hollow, substantially cylindrical shape and is arranged on the outer peripheral side of the stator 20 . The rotor 19 rotates around the stator 20 integrally with the blades 3 when power is supplied. The rotor 19 has a rotor core 17 .

The rotor core 17 is a metal member that faces the side surface of the stator core 16 and is rotatably provided. The rotor core 17 has end rings 15 .

The end rings 15 are annular members provided above and below the rotor core 17 .

The stator 20 is arranged on the inner periphery of the rotor 19 and fixed by the shaft 6 . Stator 20 includes stator core 16 , insulator 7 , A-phase winding 8 , and B-phase winding 9 .

The stator core 16 is formed into a substantially cylindrical shape by laminating magnetic steel sheets while pressing them. The stator core 16 has a central hole 21 .

The center hole 21 is a circular hole for inserting the shaft 6 into the stator core 16 and is provided at the center of the stator core 16 .

The insulator 7 covers part of the upper and lower surfaces of the stator core 16 and ensures insulation of the windings. The insulator 7 has a hollow, substantially disc shape. The insulator 7 includes a first insulator 30 and a second insulator 40 . Details of the first insulator 30 and the second insulator 40 will be described later.

The A-phase winding 8 is provided in a plurality of first slots 24 to be described later, and the B-phase winding 9 is provided in a plurality of second slots 25 to be described later. be wound. One of the A-phase winding 8 and the B-phase winding 9 is supplied with the AC voltage advanced by the operating capacitor 10, and the other is supplied with the AC voltage before the phase advance. As a result, the A-phase winding 8 and the B-phase winding 9 generate a rotating magnetic field around the stator 20, and generate rotating torque in the rotor 19 according to the principle of an induction motor.

With such a configuration, when power is supplied, the shaft 6 and stator 20 are stationary, and the upper cover 11, rotor cover 12 and rotor 19 rotate.

Next, the stator 20 will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a plan view showing a partial cross section of the stator 20. FIG. In this figure, the upper left quarter shows the stator core 16, the lower left quarter shows the state where the first insulator 30 and the second insulator 40 are mounted, and the right half shows the A phase winding 8 and the B phase. A state in which a winding 9 is applied is shown. FIG. 4 is an exploded perspective view showing the configuration of the stator 20. FIG. Hereinafter, the direction parallel to the side surface of the substantially cylindrical stator core 16 (the direction parallel to the rotating shaft of the electric motor 2) will be referred to as the "axial direction", and the direction orthogonal to the axial direction will be referred to as the "radial direction". The direction away from the hole 21 is called "radially outer", and the side opposite to the radially outer side is called "radially inner". A section along a plane including a straight line parallel to the axial direction is called a longitudinal section, and a section along a plane orthogonal to the axial direction is called a transverse section.

As shown in FIG. 3, the stator core 16 includes a first tooth portion 22, a second tooth portion 23, a first slot 24, a second slot 25, a first communication path 26, a second communication path 29 and .

The first tooth portion 22 is a rod-shaped portion extending radially outward from the outer periphery of the stator core 16 . A plurality of (for example, 14) first tooth portions 22 are arranged at predetermined intervals on the outer peripheral side of the stator core 16 .

The second toothed portion 23 is a bar-shaped portion that is bifurcated from the outer peripheral portion of the first toothed portion 22 and extends radially outward. A plurality of (for example, 28) second tooth portions 23 are arranged at predetermined intervals on the outer peripheral portion of the first tooth portion 22 . The second tooth 23 has an extension 55 .

The extension 55 forms the inner wall of the second slot 25 together with the second tooth 23 . The extension portion 55 is provided so as to extend from the extension tip of the second tooth portion 23 to the opposite side of the first communication passage 26 .

The first slots 24 are openings provided for applying the A-phase winding 8 and are provided between the plurality of first tooth portions 22 . A plurality of first slots 24 are formed with the side surface of the first tooth portion 22 as an inner wall. First slot 24 includes a first slot opening 56 .

The first slot opening 56 is an opening radially outward from the first slot 24 and is provided on the inner wall of the first slot 24 in a substantially rectangular shape.

The second slots 25 are openings provided for applying the B-phase winding 9 and are provided between the plurality of second teeth 23 . A plurality of second slots 25 are formed with the side surfaces of the second tooth portion 23 and the extension portion 55 as inner walls. A second slot opening 57 is provided.

The second slot opening 57 is an opening radially outward from the second slot 25 and is provided on the inner wall of the second slot 25 in a substantially rectangular shape.

The first communication passage 26 is a passage space that extends radially outward from each first slot opening 56 and communicates with the side surface of the substantially cylindrical stator core 16 , and is a passage space between the two adjacent second tooth portions 23 . formed between The first communication path 26 has a first opening 27 .

The first opening 27 is a substantially rectangular opening formed at the radially outer end of the first communication passage 26 . In other words, the first opening 27 is formed in a substantially rectangular shape on the side surface of the substantially cylindrical stator core 16 .

The second communication passages 29 are passage spaces that extend radially outward from the respective second slot openings 57 and communicate with the substantially cylindrical side surface of the stator core 16 , and are formed between the extension portions 55 . The second communication path 29 has a second opening 28 .

The second opening 28 is a substantially rectangular opening formed at the radially outer end of the second communicating path 29 . In other words, the second communication path 29 is formed in a substantially rectangular shape on the side surface of the substantially cylindrical stator core 16 .

The first communication path 26 and the second communication path 29 can be used as wire paths during winding. Therefore, as shown in FIG. 3, the A-phase winding 8 is applied to each first slot 24 through the first communication path 26, and through the first insulator 30 and a first slot cell 51, which will be described later, each first tooth portion. 22 is wound. Also, the B-phase winding 9 is applied to each second slot 25 through the second communication path 29, and wound around each second tooth portion 23 via a second insulator 40 and a second slot cell 53, which will be described later. .

As shown in FIG. 4, the insulator 7 according to this embodiment includes a total of four pieces that are divided into two pieces in the radial direction and two pieces in the vertical direction. That is, the insulator 7 is composed of a pair of first insulators 30 sandwiching the plurality of first teeth 22 from both sides in the axial direction, and a pair of second insulators 40 sandwiching the plurality of second teeth 23 from both sides in the axial direction. be.

The first insulator 30 is formed in an annular shape and mainly covers the first tooth portion 22 radially inside the second insulator 40 . The first insulator 30 includes a first base portion 31 and a first wall portion 32 .

The first base portion 31 is an annular portion having a planar portion perpendicular to the axial direction. The first base portion 31 is provided in contact with the axial end face of the stator core 16 and formed to cover each first tooth portion 22 .

The first wall portion 32 is a tubular portion extending axially from the first base portion 31 . The first wall portion 32 is provided along the wall surface of the first slot 24 and is formed in a substantially O-shaped annular shape in plan view. The first wall portion 32 is provided so that the height from the first base portion 31 is half or less than the axial height of the stator core 16 . The first wall portion 32 has a first insulator opening 58 .

The first insulator opening 58 is a substantially rectangular opening provided radially outward of the first wall portion 32 . The first insulator opening 58 is provided at a position corresponding to the first slot opening 56 when the first insulator 30 is attached, and has the same size as the first slot opening 56 .

The second insulator 40 is formed in an annular shape with a larger diameter than the first insulator 30 and mainly covers the second tooth portion 23 on the radially outer side of the first insulator 30 . The second insulator 40 includes a second base portion 41 and a second wall portion 42 .

The second base portion 41 is an annular portion having a planar portion orthogonal to the axial direction. The second base portion 41 is provided in contact with the axial end face of the stator core 16 and formed to cover the second tooth portion 23 .

The second wall portion 42 is a tubular portion extending axially from the second base portion 41 . The second wall portion 42 is provided along the wall surface of the second slot 25 and is formed in a substantially O-shaped annular shape in plan view. The second wall portion 42 is provided so that the height from the first base portion 31 is half or less of the axial height of the stator core 16 . The second wall portion 42 has a second insulator opening 59 .

The second insulator opening 59 is a substantially rectangular opening provided radially outward of the second wall portion 42 . The second insulator opening 59 is provided at a position corresponding to the second slot opening 57 when the second insulator 40 is attached, and has the same size as the second slot opening 57 .

In this way, by forming the first insulator 30 and the second insulator 40 independently in an annular shape, when they are mounted on the stator core 16, tensile and compressive stresses are exerted in the radial direction starting from the inner peripheral portion. Even if is added, the influence of deformation of the outer peripheral portion in the circumferential direction can be reduced. Therefore, the insertion of the second wall portion 42 into the second slot 25 is facilitated, and the workability of mounting the insulator is improved.

Further, as shown in FIG. 4, the stator 20 further includes a first slot cell 51, a first slot wedge 52, a second slot cell 53, and a second slot wedge .

The first slot cell 51 is a substantially tubular member attached to the inner circumference of the first wall portion 32 after the first insulator 30 is attached. The axial height of the first slot cells 51 is equal to or less than the axial height of the stator core 16 . That is, the axial height of the first slot cells 51 is equal to or less than the thickness of the stator core 16 . The first slot cell 51 has a first slot cell opening 60 .

The first slot cell opening 60 is a substantially rectangular opening provided radially outside the first slot cell 51 . The first slot cell opening 60 is provided at a position corresponding to the first insulator opening 58 when the first slot cell 51 is attached to the inner circumference of the first wall portion 32, and is equivalent to the first insulator opening 58. has a size of

The first slot wedge 52 is a substantially plate-shaped member mounted so as to cover the outlet of the first slot 24 to the first communication passage 26 after the A-phase winding 8 is provided. The axial height of the first slot wedge 52 is equal to or greater than the distance between one first base portion 31 and the other first base portion 31 of the pair of first insulators 30 .

The first slot cell 51 and the first slot wedge 52 are made of an insulating sheet such as a PET (polyethylene terephthalate) film, and are thinner than the first wall portion 32 . In this embodiment, the thickness of the first wall portion 32 is approximately 0.3 mm to 0.5 mm, while the thickness of the first slot cell 51 and the first slot wedge 52 is approximately 0.10 mm to 0.5 mm. It is about 25 mm.

The second slot cell 53 is a substantially cylindrical member attached to the inner circumference of the second wall portion 42 after the second insulator 40 is attached. The axial height of the second slot cells 53 is equal to or less than the axial height of the stator core 16 . That is, the axial height of the second slot cells 53 is equal to or less than the thickness of the stator core 16 . The second slot cell 53 has a second slot cell opening 61 .

The second slot cell opening 61 is a substantially rectangular opening provided radially outside the second slot cell 53 . The second slot cell opening 61 is provided at a position corresponding to the second insulator opening 59 when the second slot cell 53 is attached to the inner circumference of the second wall portion 42, and is equivalent to the second insulator opening 59. has a size of

The second slot wedge 54 is a substantially plate-shaped member mounted so as to cover the outlet of the second slot 25 to the second communication path 29 after the B-phase winding 9 is provided. The axial height of the second slot wedge 54 is equal to or greater than the distance between one second base portion 41 and the other second base portion 41 of the pair of second insulators 40 .

The second slot cells 53 and the second slot wedges 54 are made of insulating sheets such as PET films, and are thinner than the second wall portion 42 . In this embodiment, the thickness of the second wall portion 42 is approximately 0.3 mm to 0.5 mm, while the thickness of the second slot cell 53 and the second slot wedge 54 is approximately 0.10 mm to 0.5 mm. It is about 25 mm.

Next, the first insulator 30 will be described with reference to FIGS. 5A, 5B, 11A and 11B. 5A and 5B are perspective views showing the first insulator 30. FIG. 5A is a view of the first insulator 30 viewed from the stator core 16 side, and FIG. 5B is a view of the first insulator 30 viewed from the coil end side. 11A and 11B are perspective views showing enlarged main parts of FIGS. 5A and 5B.

The first insulator 30 further includes a first joint portion 33 , a first inner peripheral wall 36 , a first locking portion A 34 , a first locking portion B 35 and a first pressing portion 37 .

The first joint portion 33 is a partially arcuate portion provided on the outer peripheral side of the first base portion 31 to avoid the first communication passage 26 .

The first inner peripheral wall 36 is a cylindrical portion extending axially away from the stator core 16 from the inner peripheral end of the first base portion 31 , that is, in the opposite direction to the first wall portion 32 .

The first locking portion A34 is on the same plane as the first base portion 31 and is provided to extend from the radially outer side to the radially inner side. The first locking portion A34 is formed in a projecting shape, for example, at both opening end portions corresponding to the first insulator opening portion 58 of the first wall portion 32 . Here, the first locking portion A means the locking portion A provided on the first insulator. Further, the engaging portion A is also called an outer engaging portion in the sense that it belongs to the outer peripheral side of the insulator.

The first locking portion B35 is on the same plane as the first base portion 31 and is provided to extend from the radially inner side to the radially outer side. The first locking portion B35 is formed, for example, in a projecting shape on the side of the first wall portion 32 opposite to the first insulator opening portion 58 . Here, the first locking portion B means the locking portion B provided on the first insulator. Further, the engaging portion B is also referred to as an inner peripheral engaging portion in the sense that it belongs to the inner peripheral side of the insulator.

The first engaging portion A34 and the first engaging portion B35 contact both ends of the first slot cell 51 in the axial direction when the first slot cell 51 is attached to the inner periphery of the first wall portion 32, thereby Axial movement of the 1-slot cell 51 is suppressed.

The first pressing portions 37 are provided so as to protrude radially inward from both opening end portions corresponding to the first insulator opening portions 58 of the first wall portion 32 . The first pressing portion 37 protrudes, for example, with a length equivalent to that of the first locking portion A34.

Next, the second insulator 40 will be described with reference to FIGS. 6A, 6B, 12A and 12B. 6A and 6B are perspective views showing the second insulator 40. FIG. Here, FIG. 6A is a view of the second insulator 40 viewed from the stator core 16 side, and FIG. 6B is a view of the second insulator 40 viewed from the coil end side. 12A and 12B are perspective views showing enlarged main parts of FIGS. 6A and 6B.

The second insulator 40 includes a second joint portion 43, a second inner peripheral wall 46, a second outer peripheral wall 47, a projection portion 48, a second locking portion A44, a second locking portion B45, a second A pressing portion 50 is further provided.

The second joint portion 43 is an annular portion provided on the inner peripheral side of the second base portion 41 . In the example of FIGS. 6A and 6B, the second joint portion 43 is on the same plane as the second base portion 41, and has a shape in which strip-shaped sides are combined to form a tetragonal shape.

The second inner peripheral wall 46 is a cylindrical portion extending axially away from the stator core 16 from the inner peripheral end of the second base portion 41 , that is, in the direction opposite to the second wall portion 42 .

The second outer peripheral wall 47 is a partially cylindrical portion extending axially away from the stator core 16 from the outer peripheral portion of the second base portion 41 , that is, in the opposite direction to the second wall portion 42 . The second outer peripheral wall 47 restricts the B-phase winding 9 from protruding radially outward.

A plurality of projections 48 (for example, 14) are provided at predetermined intervals in the circumferential direction corresponding to each first communication path 26 . The projecting portion 48 axially extends from the second base portion 41 along the wall surface of the first communication passage 26 radially inward of the first opening portion 27 . The projecting portion 48 fits into the first communication passage 26 and functions as a positioning member for the stator core 16 of the second insulator 40 . Having the protrusions 48 facilitates alignment between the stator core 16 and the second insulator 40, thereby improving assembly workability.

An extension distance h48 of the protrusion 48 from the second base portion 41 is greater than an extension distance h42 of the second wall portion 42 from the second base portion 41. In this case, when the second insulator 40 is attached, since the projection 48 having a longer extension distance (higher height) from the second base 41 is first guided inward from the first opening 27, it is fixed. The child core 16 and the second insulator 40 are aligned, and the second wall portion 42 can be easily placed over the stator core 16 . As a result, assembly workability is improved.

The second locking portion A44 is on the same plane as the second base portion 41 and is provided to extend from the radially outer side to the radially inner side. The second locking portion A44 is formed in a projecting shape at both ends of the opening corresponding to the second insulator opening 59 of the second wall portion 42, for example. Here, the second locking portion A means the locking portion A provided on the second insulator. Further, the engaging portion A is also called an outer engaging portion in the sense that it belongs to the outer peripheral side of the insulator.

The second locking portion B45 is on the same plane as the second base portion 41 and is provided to extend from the radially inner side to the radially outer side. The second locking portion B45 is formed in a projecting shape, for example, on the side of the second wall portion 42 opposite to the second insulator opening portion 59 . Here, the second locking portion B means the locking portion B provided on the second insulator. Further, the engaging portion B is also referred to as an inner peripheral engaging portion in the sense that it belongs to the inner peripheral side of the insulator.

When the second slot cell 53 is attached to the inner periphery of the second wall portion 42, the second locking portion A44 and the second locking portion B45 come into contact with both ends of the second slot cell 53 in the axial direction. Axial movement of the 2-slot cell 53 is suppressed.

The second pressing portions 50 are provided so as to protrude radially inward from both opening end portions corresponding to the second insulator opening portions 59 of the second wall portion 42 . The second pressing portion 50 protrudes, for example, with a length equivalent to that of the second locking portion A44.

Next, the procedure for assembling the stator 20 will be described with reference to FIGS. 7A to 7D. 7A to 7D are diagrams showing the assembly procedure of the stator 20. FIG.

(1) First, two first insulators 30 are attached to the stator core 16 from above and below, and then the first slot cells 51 are attached (Fig. 7A). The first insulator 30 inserts the first wall portion 32 along the inner wall of the first slot 24 to bring the first base portion 31 and the axial end portion of the stator core 16 into contact with each other. At this time, the first wall portion 32 is inserted from one end of the first slot 24 because the height from the first base portion 31 is less than half the height of the stator core 16 in the axial direction. can be prevented from colliding with the first wall portion 32 inserted from the other end. The first slot cell 51 is mounted on the inner circumference of the first wall portion 32, and the axial ends thereof are brought into contact with the first locking portion A34 and the first locking portion B35 of the first wall portion 32, whereby the first slot cell 51 is opened. Axial movement on the inner circumference of the wall portion 32 is suppressed. Further, the first slot cell 51 is configured such that the first pressing portion 37 of the first insulator 30 is clamped between both opening end portions corresponding to the first slot cell opening portion 60, so that the inner circumference of the first wall portion 32 is compressed in the circumferential direction. movement is suppressed.

(2) Next, the A-phase winding 8 is wound by a winding machine, and then the first slot wedge 52 is attached (Fig. 7B). The first slot wedge 52 is provided at a position facing the first slot cell opening 60 between the first slot cell 51 and the A-phase winding 8 .

(3) Next, two second insulators 40 are attached to the stator core 16 from above and below, and then the second slot cells 53 are attached (Fig. 7C). The second insulator 40 inserts the second wall portion 42 along the inner wall of the second slot 25 to bring the second base portion 41 and the axial end portion of the stator core 16 into contact with each other. At this time, the second wall portion 42 is inserted from one end of the second slot 25 because the height from the second base portion 41 is half or less than the height of the stator core 16 in the axial direction. can be prevented from colliding with the second wall portion 42 inserted from the other end. The second slot cell 53 is mounted on the inner periphery of the second wall portion 42, and the axial ends thereof are brought into contact with the second locking portion A44 and the second locking portion B45 of the second wall portion 42, whereby the second slot cell 53 is mounted on the second wall portion 42. Axial movement on the inner circumference of the wall portion 42 is suppressed. Further, the second slot cell 53 is configured such that the second pressing portion 50 of the second insulator 40 is sandwiched between both opening end portions corresponding to the second slot cell opening portion 61, so that the inner circumference of the second wall portion 42 is compressed in the circumferential direction. movement is suppressed.

(4) Next, the B-phase winding 9 is wound by a winding machine, and then the second slot wedge 54 is attached (Fig. 7D). The second slot wedge 54 is provided at a position facing the second slot cell opening 61 between the second slot cell 53 and the B-phase winding 9 . After that, the stator 20 is completed through additional processes such as tip treatment of the wires of the windings.

Next, cross sections of the stator 20 will be described with reference to FIGS. 8A to 8D. 8A shows a longitudinal section along the BB line in FIG. 3, FIG. 8B shows a longitudinal section along the CC line in FIG. 3, and FIG. 8C shows a DD line in FIG. FIG. 8D shows a longitudinal section along line FF of FIG.

As shown in FIGS. 8A and 8C, the first locking portion B35 and the first locking portion A34 extend radially to hold the first slot cell 51. As shown in FIGS. The first slot wedge 52 is interposed on the outer peripheral side of the A-phase winding 8 to restrict protrusion to the outer peripheral side. The first inner peripheral wall 36 extends axially on the inner peripheral side of the A-phase winding 8 and prevents the A-phase winding 8 from collapsing toward the inner peripheral side. The second outer peripheral wall 47 extends in the axial direction on the outer peripheral side of the B-phase winding 9 and prevents the B-phase winding 9 from collapsing toward the outer peripheral side. The second inner peripheral wall 46 extends in the axial direction on the inner peripheral side of the B-phase winding 9 and prevents the B-phase winding 9 from collapsing toward the inner peripheral side.

As shown in FIGS. 8B and 8D, the second locking portion B45 and the second locking portion A44 extend radially to hold the second slot cell 53. As shown in FIGS. Also, the first joint portion 33 and the second joint portion 43 overlap in the axial direction on the end surface of the stator core 16 . In this example, the second joint 43 overlaps the first joint 33 .

As shown in FIG. 8C, the first slot cell 51 and the first slot wedge 52 partially overlap, thereby ensuring an insulation distance (creeping distance). Also, the second inner peripheral wall 46 extends between the A-phase winding 8 and the B-phase winding 9 to prevent contact therebetween.

Next, a cross section of the stator 20 will be further described with reference to FIGS. 9 and 10. FIG. 9 is a cross-sectional view taken along line AA of FIG. 2. FIG. FIG. 10 is a vertical cross-sectional view taken along line EE in FIG.

As shown in FIG. 9, the first slot wedge 52 is inserted between the A-phase winding 8 and the radially outer edge of the first slot cell 51 . In other words, the first slot wedge 52 is provided at a position facing the first slot cell opening 60 . Thereby, the creepage distance between the A-phase winding 8 and the stator core 16 can be secured. The end of the first slot cell 51 and the end of the first slot wedge 52 overlap each other. Also, the first slot wedge 52 is pressed radially inward by the first pressing portion 37 . In other words, the first pressing portion 37 presses the first slot wedge 52 against the A-phase winding 8 to hold the first slot wedge 52 .

The second slot wedge 54 is inserted between the B-phase winding 9 and the radially outer end of the second slot cell 53 . In other words, the second slot wedge 54 is provided at a position facing the second slot cell opening 61 . Thereby, the creepage distance between the B-phase winding 9 and the stator core 16 can be secured. The end of the second slot cell 53 and the end of the second slot wedge 54 overlap each other. Also, the second slot wedge 54 is pressed radially inward by the second pressing portion 50 . In other words, the second pressing portion 50 presses the second slot wedge 54 against the B-phase winding 9 to hold the second slot wedge 54 .

The first slot cell 51 is arranged between one first pressing portion 37 and the other first pressing portion 37 along the first wall portion 32 in the circumferential direction of the first slot 24 . The first slot cell 51 is restrained from moving in the circumferential direction on the inner circumference of the first slot 24 by the first pressing portion 37 . As a result, when the A-phase winding 8 is applied, the first slot cell 51 does not obstruct the passage of the wire, so that the winding work can be performed smoothly.

The second slot cell 53 is arranged in the circumferential direction of the second slot 25 from one second pressing portion 50 to the other second pressing portion 50 along the second wall portion 42 . The second slot cell 53 is restrained from moving in the circumferential direction on the inner circumference of the second slot 25 by the second pressing portion 50 . As a result, when the B-phase winding 9 is applied, the second slot cell 53 does not obstruct the passage of the wire, so that the winding work can be performed smoothly.

A first locking portion A34, a first locking portion B35, a second locking portion A44, a second locking portion B45, a first pressing portion 37 and a second pressing portion 50 (hereinafter collectively referred to as "specific protrusions") is provided at a position that does not interfere with the A-phase winding 8 and the B-phase winding 9 . The coil wound in a ring projects outwardly at the center in the vertical direction, and rounded corners R62 are formed at the respective corners. For this reason, interference with the winding can be avoided by providing the specific projection near the corners of the winding, avoiding the upper and lower central portions of the winding. The corner R62 provided at each corner is also called a corner.

In the prior art, as shown in FIGS. 13, 14A and 14B, the slots are narrowed by the thickness of the upper and lower walls and the width of the clearance (dimension Y in FIG. 14B), so the slot space factor of the winding is was declining.

In this embodiment, as shown in FIG. 10, the first wall portion 32 of the first insulator 30 is inserted along the inner wall of the first slot 24 in both the upper and lower directions. A useless gap is hardly formed between the first wall portion 32 and the second wall portion 32.例文帳に追加Also, since the thickness of the first slot cell 51 is thinner than the thickness of the first wall portion 32, the total thickness (dimension X) of the first wall portion 32 and the first slot cell 51 is smaller than the dimension Y in FIG. 14B. Become. The second slot 25 has a similar configuration, and the second wall portion 42 of the second insulator 40 is inserted along the inner wall of the second slot 25 both up and down, and the thickness of the second slot cell 53 is equal to that of the second wall portion 42 . thinner than the thickness of With such a configuration, the stator of the present disclosure has wider slots than conventional ones, and the slot space factor of the windings can be improved. In addition, in the stator of the present disclosure, the circumference of the windings is shorter than in the conventional stator, so the electrical resistance of the windings can be reduced, and the electrical efficiency of the electric motor can be improved while securing the insulation distance. Furthermore, by shortening the circumference of the windings compared to the conventional one, it is possible to make the electric motor thinner.

The present disclosure has been described above based on the examples. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications are possible in the combination of each component or each treatment process, and such modifications are within the scope of the present disclosure. .

[Modification]
Modifications will be described below. In the drawings and description of the modified example, the same reference numerals are given to the same or equivalent components and members as those of the embodiment. Descriptions that overlap with the embodiment will be omitted as appropriate, and the configuration that is different from the first embodiment will be mainly described.

In the description of the embodiment, an example was shown in which the pair of insulators had the same shape, but the upper and lower insulators may have different shapes.

Any combination of the above components is also effective as a mode of technical ideas that abstract the embodiments and modifications. For example, an embodiment may be combined with any description matter of another embodiment, or a modification may be combined with any description matter of an embodiment and another modification.

The embodiments and modifications have been described above. In understanding the technical ideas abstracted from the embodiments and modifications, the technical ideas should not be construed to be limited to the contents of the embodiments and modifications. The above-described embodiments and modifications are merely specific examples, and many design changes such as alterations, additions, and deletions of constituent elements are possible. In the embodiment, the description of "embodiment" is added to emphasize the content that allows such design changes. However, design changes are permitted even if there is no such notation.

A motor according to the present disclosure can be applied, for example, to a driving motor for a ceiling fan.

Reference Signs List 1 Ceiling fan 2 Electric motor 3 Blade 4 Strut 5 Body cover 6 Shaft 7 Insulator 8 A-phase winding 9 B-phase winding 10 Operating capacitor 11 Upper cover 12 Rotor cover 13a, 13b Bearing housing parts 14a, 14b Ball bearing 15 End Ring 16 Stator core 17 Rotor core 19 Rotor 20 Stator 21 Center hole 22 First tooth 23 Second tooth 24 First slot 25 Second slot 26 First communication passage 27 First opening 28 Second opening Portion 29 Second communication passage 30 First insulator 31 First base portion 32 First wall portion 33 First joint portion 34 First locking portion A
35 first locking portion B
36 First inner peripheral wall 37 First pressing portion 40 Second insulator 41 Second base portion 42 Second wall portion 43 Second joint portion 44 Second locking portion A
45 second locking portion B
46 Second inner peripheral wall 47 Second outer peripheral wall 48 Projection 50 Second pressing portion 51 First slot cell 52 First slot wedge 53 Second slot cell 54 Second slot wedge 55 Extension 56 First slot opening 57 Second slot opening 58 First insulator opening 59 Second insulator opening 60 First slot cell opening 61 Second slot cell opening 62 Corner R
100

Stator

101a, 101b Insulator 102 Stator Core 103 Slot

Claims

a substantially cylindrical stator core having slots;
a pair of insulators sandwiching the stator core from both sides in the axial direction of the substantially cylindrical shape;
a winding that is annularly wound around the stator core via the pair of insulators,
Each of the pair of insulators
a base portion having a planar portion perpendicular to the axial direction and in contact with an end portion of the substantially cylindrical stator core in the axial direction;
a wall extending axially from the base along an inner wall of the slot;
a substantially cylindrical slot cell mounted on the inner periphery of the wall;
stator.
the thickness of the slot cell is less than the thickness of the wall,
A stator according to claim 1 .
The height of the wall from the base is less than half the thickness of the stator core,
A stator according to claim 1 .
the axial height of the slot cells is less than or equal to the thickness of the stator core;
A stator according to claim 1 .
The wall portion
an outer peripheral locking portion provided on the same plane as the base portion and extending from the radially outer side of the substantially cylindrical shape toward the radially inner side;
an inner peripheral locking portion provided on the same plane as the base portion and extending from the radially inner side toward the radially outer side;
The slot cell is
The outer circumference side locking portion and the inner circumference side locking portion provided on one insulator of the pair of insulators, and the outer circumference provided on the other insulator of the pair of insulators, which is different from the one insulator. By the outer circumferential side locking portion and the inner circumferential side locking portion disposed between the side locking portion and the inner circumferential side locking portion and provided in the one insulator and the other insulator, respectively the axial movement is restrained;
A stator according to claim 1 .
The stator core is
including a slot opening that opens outward in the radial direction of the substantially cylindrical shape from the slot, and a communication path that communicates from the slot opening toward the side surface of the stator core,
The wall portion
having an insulator opening corresponding to the slot opening;
The slot cell is
a slot cell opening corresponding to the insulator opening;
a substantially plate-shaped slot wedge provided between the slot cell and the winding and at a position facing the slot cell opening,
A stator according to claim 1 .
The axial height of the slot wedge is
The distance between the base portion provided on one insulator of the pair of insulators and the base portion provided on the other insulator of the pair of insulators different from the one insulator is equal to or larger than the distance,
A stator according to claim 6 .
The wall portion
a pressing portion that protrudes radially inward from both ends of the opening of the insulator opening and abuts on the slot wedge;
The pressing part is
pressing the slot wedge radially inward and holding it against the winding;
A stator according to claim 6 .
The wall portion
a pressing portion that protrudes radially inward from both ends of the opening of the insulator opening and abuts on the slot wedge;
The slot cell is
Both ends of the opening of the slot cell opening sandwich the pressing portion, and the pressing portion suppresses movement in the circumferential direction on the inner periphery of the slot.
A stator according to claim 6 .
The winding is
The annular winding has rounded corners in the vicinity of the outer locking portion and the inner locking portion,
A stator according to claim 5 .
The winding is
Having a rounded corner portion near the pressing portion in the annular winding,
A stator according to claim 8 or 9.
An electric motor comprising the stator according to claim 1.
a plurality of first tooth portions; first slots formed between the plurality of first tooth portions; and extending radially outward from each of the plurality of first tooth portions. a stator core having a plurality of second teeth formed between the second teeth and second slots formed between the plurality of second teeth;
a pair of first insulators sandwiching the plurality of first teeth from both sides in the axial direction of the stator core;
a pair of second insulators provided separately from the pair of first insulators and sandwiching the plurality of second tooth portions from both sides in the axial direction;
A phase winding applied to the first slot;
a B-phase winding applied to the second slot;
a rotor rotatably provided facing the side surface of the stator core,
Each of the pair of first insulators,
a first base having a planar portion orthogonal to the rotation axis of the rotor;
a first wall portion extending in the axial direction from the first base portion along the wall surface of the first slot;
Each of the pair of second insulators,
a second base having a planar portion orthogonal to the rotation axis;
a second wall extending in the axial direction from the second base along the wall of the second slot;
Electric motor.
each of the plurality of second tooth portions has a first communication passage extending outward in the radial direction from the first slot;
The second insulator has a protrusion extending from the second base toward the first communication path,
14. The electric motor according to claim 13.
the axial extension distance of the protrusion from the second base is greater than the axial extension distance of the second wall from the second base;
15. The electric motor according to claim 14.
Each outer peripheral portion of the pair of first insulators is provided with a portion that overlaps with each inner peripheral portion of each of the pair of second insulators in the axial direction,
The electric motor according to any one of claims 13-15.